A laser tailor welding curved surface seam measurement method and its realization device

Abstract

The invention relates to a laser tailored welding curved surface abutted seam measuring method and a realization device thereof. The method comprises the following steps: generating circular structured light by utilizing a circular laser, and generating horizontal-I linear structured light by utilizing a horizontal-I linear laser, wherein the circular structured light and the horizontal-I linear structured light are projected to the surface of a curved surface abutted seam and intersected; collecting and obtaining an abutted seam surface gray level image comprising the horizontal-I linear structured light and the circular structured light through a sensing unit, and transmitting the collected image to an image processing unit; and carrying out processing by the image processing unit on the collected image to obtain three-dimensional position and normal vector of the curved surface abutted seam center and abutted seam width and mismatching values. The device comprises the sensing unit for collecting the laser tailored welding curved surface abutted seam image and transmitting the image to the processing unit; the image processing unit for carrying out processing on the collected abutted seam image; and a parameter setting and control unit for setting parameters and in communication connection with the sensing unit, the image processing unit and an upper computer. The laser tailored welding curved surface abutted seam measurement precision is improved, online tracking adjustment of the pose of a welding torch for curved surface laser tailored welding is realized favorably, welding quality is ensured.

Description

technical field [0001] The invention belongs to the technical field of seam tracking and detection, and in particular relates to a method for measuring a seam of a laser tailor welding curved surface and a device for realizing it. Background technique [0002] Tailored laser welding uses laser as welding energy to butt weld a number of plates with different materials, different thicknesses and different coatings. For curved surface seams, due to the different sources of the pieces to be soldered, there are differences in the quality of the edge of the pieces, it is difficult to ensure the consistency and repeatability of the entire seam size, and due to the existence of welding stress, it will make the welding process The weld gap changes. Therefore, in the welding process, it is difficult to meet the welding accuracy and quality requirements only by teaching, reproduction and pre-clamping methods. In order to ensure the welding quality and improve the adaptability of lase...

AI Technical Summary

Problems solved by technology

However, the existing seam tracking system cannot obtain the normal vector of the surface at the center of the weld in real time for curved surface joints, and cannot perform closed-loop control of production

[0004] The Chinese invention patent "Measurement Method and Device for Narrow Butt Welding Seam in Laser Welding" with the patent number ZL200810048525.7 uses three structured light patterns to approximate the local surface of the weld through plane fitting, thereby realizing the flat seam of the curved surface Width, center position and normal vector measurement, measurement accuracy needs to be further improved

Images